Technical
Data
Sheet
Fosroc® Conbextra HES
High early strength, rapid setting,
flowable, cementitious precision grout
Uses
Conbextra HES is used for free flow grouting in a wide range
of applications where rapid strength gain is
a prerequisite.
Advantages
R
apid strength gain facilitates rapid installation and
operation of plant within a matter of hours
Conbextra HES is a blend of cements, graded aggregates
and additives which impart controlled expansion in hardened
state. The aggregate grading minimises segregation and
bleeding over a wide range of application consistencies.
Maximum aggregate size is 5.0 mm.
Technical Support
Parchem offers a comprehensive range of high quality, high
performance construction products. In addition, Parchem
offers a worldwide technical support and on-site service to
specifiers, end-users and contractors.
H
igh strength gain is achievable even at low
temperatures
Specification Clauses
Excellent initial flow and flow retention
Performance specification
U
nique system compensates for shrinkage in hardened
state
H
igh ultimate strength and low permeability ensure
durability of the hardened grout
Chloride free
S
uitable for pumping or pouring over a large range of
application consistencies and temperatures
Description
Conbextra HES, rapid set high strength cementitious
precision grout, is supplied as a ready to use powder. The
addition of a controlled amount of clean water produces a
free-flowing grout for gap thicknesses of
15 - 150 mm. In addition the low water requirement ensures
high early strength and long term durability.
October 2014
All grouting (specify details and areas of application) must be
carried out with a pre-packaged cement based product,
which is non-metallic and chloride-free.
It shall be mixed with clean water to the required consistency
and not exhibit bleed or segregation.
The compressive strength of the grout must be at least
35 MPa at 4 hours (Plastic consistency).
The storage, handling and placement of the grout must be in
strict accordance with the manufacturer’s instructions.
Supplier specification
All grouting (specify details and areas of application) must be
carried out using Conbextra HES manufactured by Parchem
and used in accordance with the manufacturer’s current
Technical Data Sheet.
Page 1
Fosroc® Conbextra HES
Properties
Test Method
Compressive Strength
Bond Strength by Pull Off
Chloride ion Content
Standard
AS 1478.2:2005
Result
Consistency
Water
Addition
2
4
hours hours
Plastic
2.0-2.3
30
Flowable
2.3-2.6
25
8
hours
24
hours
28
days
35
40
42
58
30
35
37
50
EN 1542:1999
2.6MPa
EN 1015-17:2000
0.004%
Fire Rating
EN 13687-1:2002
Flexural Strength
(Modulus of Rupture)
AS 1012.11 - 2000
1 Day
7 Days
28 Days
3.0 MPa
4.5 MPa
6.5 MPa
Indirect Tensile Strength
AS 1012.10.2000
1 Day
7 Days
28 Days
1.5 MPa
2.5 MPa
3.0 MPa
Setting Time
AS 1012.18:1996
Class A1 Non-Combustible
30-40 mins - initial set
50-50 mins - final set
Fresh Wet Density
Alkali reactive particles
Flow Characteristics
2200 kg/m³ - depending on consistency used
Rapid Mortar Bar Test
(RTA T363)
Non-reactive
AS 1478.2:2005
350mm (Flow Trough)
Minimum Thickness
Maximum Thickness
15mm
150mm
Clarification of property values: The typical properties given above are derived from laboratory testing. Compressive strengths
stated above were measured using cube samples. Test results obtained will vary if carried out to an alternative standard or
sample dimensions are used.
Note: Compressive strengths stated were measured at bottom end water, eg., the 28 day strength of 50 MPa for flowable
consistency was obtained at a water addition of 2.3 litres water per 20kg bag of Conbextra HES.
Test Results to ASTM Specification C1107: 2001
Test Method
Standard
Result
Flow Consistency
ASTM C1437:2007
136%
Setting Time
ASTM C191:2008
Initial:
Final:
Plastic Volume Change
ASTM C1090:2010
+0.38%
Hardened Volume Change
ASTM:C827:2010
1 day
3 days
14 days
28 days
56 days
30 minutes
65 minutes
0.007%
0.04%
0.03%
0.03%
0.03%
Note: All tests were carried out at 25oC ± 2oC until the age of the test. All above test results are independent third party results.
Copies of these test results are available on request. The tests were carried out at a water addition rate of 2.3L per 20kg.
Page 2
Fosroc® Conbextra HES
Application Instructions
The selected water content should be accurately measured
into the mixer. Slowly add the total contents of the Conbextra
HES bag, mix continuously for 5 minutes, ensuring a smooth,
even consistency is obtained.
Foundation surface
The substrate surface must be free from oil, grease or any
loosely adherent material. If the concrete surface is defective
or has laitance, it must be cut back to a sound base. Bolt
holes or fixing pockets must be blown clean
of any dirt or debris.
Placing
Place the grout within 10 minutes of mixing.
Conbextra HES can be placed in thicknesses from 15 mm up
to 150 mm in a single pour when used as an underplate
grout. Where the grouting gap beneath the base plate
exceeds the maximum thickness allowed, then the grout can
filled / bulked out with Conbextra Grout Aggregate* to
minimise exotherm heat build up. Alternatively Conbextra
Deep pour is available for pours up to 500 mm thick.
Pre-soaking
Several hours prior to grouting, the area of cleaned
foundation should be flooded with fresh water. Immediately
before grouting takes place, any free water should be
removed. Particular care should be taken to blow out all bolt
holes and pockets.
Base plate
It is essential that this is clean and free from oil, grease, paint
or scale. Air pressure relief holes should be provided to allow
venting of any isolated high spots.
Levelling shims
If these are to be removed after the grout has hardened, they
should be treated with a thin layer of grease.
Formwork
The formwork should be constructed to be leakproof as
Conbextra HES is a free flowing grout. This can be achieved
by using foam rubber strip or Construction Silicone sealant
beneath the constructed formwork and between joints.
The unrestrained surface area of the grout must be kept to a
minimum. Generally the gap width between the perimeter
formwork and the plate edge should not exceed 150mm on
the pouring side and 50 mm on the opposite side. There
should be no gap at the flank sides.
The mixed grout should be poured only from one side of the
void to eliminate the entrapment of air or surplus pre-soaking
water. This is best achieved by pouring the grout across the
shortest distance of travel. The grout head must be
maintained at all times so that a continuous grout front is
achieved.
On completion of the grouting operation, exposed areas
should be thoroughly cured. This should be done by the use
of a Concure curing membrane, or the continuous application
of water and/or wet hessian.
Cleaning
Conbextra HES should be removed from tools and
equipment with clean water immediately after use. Cured
material can be removed mechanically.
Mixing
For best results a mechanically powered grout mixer should
be used. When quantities up to 40 kg are used, a slow speed
drill fitted with a high shear mixer with a minimum 1200W
and between 300-650 rpm. The Protool MXP 1602 E mixer
(product code: TT-621941) or equivalent is recommend with
the Protool HS2 140 x 600 M14 Helical mixing paddle
(product code: TT-614217) or equivalent.
It is essential that machine mixing capacity and labour
availability is adequate to enable the grouting operation
to be carried out continuously. This may require the use
of a holding tank with provision for gentle agitation to
maintain fluidity.
Sufficient grout must be available prior to starting and the
time taken to pour a batch must be regulated to the time
taken to prepare the next one.
Curing
In some cases it is practical to use a sacrificial semi-dry sand
and cement formwork. The formwork should include outlets
for the pre-soaking water.
Larger quantities will require a high shear vane mixer. Do not
use a colloidal impeller mixer.
Filling/bulking out of the grout should not exceed a ratio of
1:1. Please refer to the Conbextra Grout Aggregate TDS for
more guidance on bulking out of cement based grouts.
Continuous grout flow is essential.
Limitations
Low temperature working
When the air or contact surface temperatures are 15°C or
below on a falling thermometer, warm water (30°C ) is
recommended to accelerate strength development.
For ambient temperatures below 15°C the grout consistency
should be flowable and the formwork should be maintained
in place for a minimum of 24 hours.
Normal precautions for winter working with cementitious
materials should be adopted.
Page 3
Fosroc® Conbextra HES
High temperature working
Conbextra HES should not be used at ambient temperatures
above 35°C as premature setting of the grout may occur
making handling and placement very difficult.
Estimating
Supply
201060 - Conbextra HES and 202021 - Conbextra Grout
Aggregate are available in 20kg moisture resistant bags.
Consistency
Yield (litres)/20 kg
Plastic
10.00
Flowable
10.20
Storage
Conbextra HES has a shelf life of 12 months if kept in a dry
store in sealed bags. If stored in high temperature and high
humidity locations, the shelf life may be reduced.
Important notice
A Safety Data Sheet (SDS) and Technical Data Sheet (TDS) are available from the Parchem website or upon request from the nearest Parchem sales office. Read the SDS and TDS carefully
prior to use as application or performance data may change from time to time. In emergency, contact any Poisons Information Centre (phone 13 11 26 within Australia) or a doctor for advice.
Product disclaimer
This Technical Data Sheet (TDS) summarises our best knowledge of the product, including how to use and apply the product based on the information available at the time. You should read
this TDS carefully and consider the information in the context of how the product will be used, including in conjunction with any other product and the type of surfaces to, and the manner in
which, the product will be applied. Our responsibility for products sold is subject to our standard terms and conditions of sale. Parchem does not accept any liability either directly or indirectly for
any losses suffered in connection with the use or application of the product whether or not in accordance with any advice, specification, recommendation or information given by it.
*Manufactured and sold under license from Fosroc International
Limited. Fosroc and the Fosroc logo are trade marks of Fosroc
International Limited, used under license. *Denotes a trade mark of
Fosroc International Limited.
Page 4
Parchem Construction Supplies Pty Ltd
7 Lucca Road, Wyong NSW 2259
Phone: 1300 737 787
www.parchem.com.au
ABN 80 069 961 968
Distributed in New Zealand by: Concrete Plus Ltd
23 Watts Rd, Sockburn 8042 Ph: 03 343 0090